Set of key buttons for a handset



FIG. 1 is a bottom view of a set of key buttons for a handset showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front perspective view thereof.

The broken line showing of the remainder of the handset is directed to environment, is for illustrative purposes only, and forms no part of the claimed design. 

The ornamental design for a set of key buttons for a handset, as shown and described. 